package com.scott.ch04.before.student.service;

public class StudentService {

    public int add(int x, int y){
        // .... 此次省略1万行代码
        int sum =x+y;
        return sum;
    }
    public int sub(int x, int y){
        // .... 此次省略1万行代码
        int sum =x-y;
        return sum;
    }
}
